* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --success-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --dark-gradient: linear-gradient(135deg, #1e3c72 0%, #2a5298 100%);
    
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --success-color: #4facfe;
    --danger-color: #f5576c;
    
    --text-primary: #1a202c;
    --text-secondary: #4a5568;
    --text-light: #718096;
    
    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --bg-overlay: rgba(255, 255, 255, 0.95);
    
    --border-color: #e2e8f0;
    --border-radius: 16px;
    --border-radius-small: 12px;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.15);
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s cubic-bezier(0.4, 0, 0.2, 1);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: var(--bg-secondary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* Background Effects */
.bg-gradient {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 500px;
    background: var(--primary-gradient);
    opacity: 0.1;
    z-index: -1;
    pointer-events: none;
}

.bg-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: -1;
    pointer-events: none;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.15;
    animation: float 20s infinite ease-in-out;
}

.shape-1 {
    width: 400px;
    height: 400px;
    background: var(--primary-gradient);
    top: -100px;
    right: -100px;
    animation-delay: 0s;
}

.shape-2 {
    width: 350px;
    height: 350px;
    background: var(--secondary-gradient);
    bottom: -100px;
    left: -100px;
    animation-delay: 5s;
}

.shape-3 {
    width: 300px;
    height: 300px;
    background: var(--success-gradient);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 10s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    33% {
        transform: translate(30px, -30px) scale(1.1);
    }
    66% {
        transform: translate(-20px, 20px) scale(0.9);
    }
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header */
.header {
    background: var(--bg-overlay);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: var(--shadow-sm);
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 700;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    gap: 8px;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 20px;
    background: transparent;
    border: none;
    border-radius: var(--border-radius-small);
    font-size: 15px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.nav-btn::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%) scaleX(0);
    width: 80%;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: 3px 3px 0 0;
    transition: var(--transition);
}

.nav-btn:hover {
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.05);
}

.nav-btn.active {
    color: var(--primary-color);
    background: rgba(102, 126, 234, 0.1);
}

.nav-btn.active::before {
    transform: translateX(-50%) scaleX(1);
}

/* Main Content */
.main {
    padding: 48px 0;
    min-height: calc(100vh - 80px);
}

/* Tabs */
.tab-content {
    display: none;
    animation: fadeIn 0.4s ease-in-out;
}

.tab-content.active {
    display: block;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Cards */
.card {
    background: var(--bg-primary);
    border-radius: var(--border-radius);
    padding: 40px;
    box-shadow: var(--shadow-md);
    margin-bottom: 24px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.hero-card {
    text-align: center;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.title {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 12px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.subtitle {
    font-size: 16px;
    color: var(--text-secondary);
    margin-bottom: 32px;
}

.card-title {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--text-primary);
}

/* Scanner */
.scanner-container {
    max-width: 600px;
    margin: 0 auto 32px;
    border-radius: var(--border-radius);
    overflow: hidden;
    background: #000;
    position: relative;
}

.qr-reader {
    width: 100%;
    border-radius: var(--border-radius);
}

.reader-placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 40px;
    background: linear-gradient(135deg, #667eea15 0%, #764ba215 100%);
    color: var(--text-secondary);
}

.reader-placeholder svg {
    margin-bottom: 20px;
    opacity: 0.5;
}

.reader-placeholder p {
    font-size: 16px;
    font-weight: 500;
}

/* Buttons */
.button-group {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    border: none;
    border-radius: var(--border-radius-small);
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:active::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--primary-gradient);
    color: white;
    box-shadow: 0 4px 16px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: var(--secondary-gradient);
    color: white;
    box-shadow: 0 4px 16px rgba(118, 75, 162, 0.3);
}

.btn-secondary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(118, 75, 162, 0.4);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-gradient);
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
}

.btn-small {
    padding: 10px 20px;
    font-size: 14px;
}

/* Result Card */
.result-card {
    animation: slideUp 0.4s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-content {
    text-align: center;
}

.result-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: var(--success-gradient);
    color: white;
    margin-bottom: 24px;
    animation: scaleIn 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

@keyframes scaleIn {
    from {
        transform: scale(0);
    }
    to {
        transform: scale(1);
    }
}

.result-text {
    background: var(--bg-secondary);
    padding: 20px;
    border-radius: var(--border-radius-small);
    margin-bottom: 24px;
    border-left: 4px solid var(--primary-color);
}

.result-text p {
    font-size: 16px;
    color: var(--text-primary);
    word-break: break-all;
    line-height: 1.8;
}

.result-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
}

/* Form Elements */
.form-group {
    margin-bottom: 24px;
    text-align: left;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.form-group textarea,
.form-group select {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius-small);
    font-size: 15px;
    font-family: inherit;
    color: var(--text-primary);
    background: var(--bg-primary);
    transition: var(--transition);
}

.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* QR Display */
.qr-display {
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 40px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius);
    margin-bottom: 24px;
}

#qrcode {
    display: inline-block;
    padding: 20px;
    background: white;
    border-radius: var(--border-radius-small);
    box-shadow: var(--shadow-lg);
}

#qrcode img,
#qrcode canvas {
    display: block;
    border-radius: 8px;
}

/* History */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    background: var(--bg-secondary);
    border-radius: var(--border-radius-small);
    border-left: 4px solid var(--primary-color);
    transition: var(--transition);
    animation: slideIn 0.3s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.history-item:hover {
    background: white;
    box-shadow: var(--shadow-md);
    transform: translateX(4px);
}

.history-info {
    flex: 1;
}

.history-text {
    font-size: 15px;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 4px;
    word-break: break-all;
}

.history-time {
    font-size: 13px;
    color: var(--text-light);
}

.history-actions {
    display: flex;
    gap: 8px;
}

.history-btn {
    padding: 8px 12px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
}

.history-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 80px 40px;
    color: var(--text-light);
}

.empty-state svg {
    margin-bottom: 20px;
    opacity: 0.3;
}

.empty-state p {
    font-size: 16px;
    font-weight: 500;
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 32px;
    right: 32px;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 24px;
    background: var(--primary-gradient);
    color: white;
    border-radius: var(--border-radius-small);
    box-shadow: var(--shadow-xl);
    transform: translateY(150%);
    transition: var(--transition);
    z-index: 1000;
    font-weight: 500;
}

.toast.show {
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    .header .container {
        flex-direction: column;
        gap: 16px;
    }

    .nav {
        width: 100%;
        justify-content: space-between;
    }

    .nav-btn {
        flex: 1;
        justify-content: center;
        padding: 12px 8px;
        font-size: 13px;
    }

    .nav-btn svg {
        width: 16px;
        height: 16px;
    }

    .card {
        padding: 24px;
    }

    .title {
        font-size: 24px;
    }

    .subtitle {
        font-size: 14px;
    }

    .button-group {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .result-actions {
        flex-direction: column;
    }

    .history-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 12px;
    }

    .history-actions {
        width: 100%;
        justify-content: flex-end;
    }

    .toast {
        bottom: 16px;
        right: 16px;
        left: 16px;
    }
}

/* Loading Animation */
@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}